# Assume the entire cycle to be reversible and the heat

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Unformatted text preview: al energy changes of water, and take the specific volume of water to be 0.001 m3/kg. Answer: 2100 kPa P2 PUMP 10 kW 100 kPa FIGURE P7–82 7–83E Saturated refrigerant-134a vapor at 20 psia is compressed reversibly in an adiabatic compressor to 120 psia. Determine the work input to the compressor. What would your answer be if the refrigerant were first condensed at constant pressure before it was compressed? 7–84 Consider a steam power plant that operates between the pressure limits of 10 MPa and 20 kPa. Steam enters the pump as saturated liquid and leaves the turbine as saturated vapor. Determine the ratio of the work delivered by the turbine to the work consumed by the pump. Assume the entire cycle to be reversible and the heat losses from the pump and the turbine to be negligible. 7–85 Reconsider Prob. 7–84. Using EES (or other) software, investigate the effect of the quality of the steam at the turbine exit on the net work output. Vary the quality from 0.5 to 1.0, and plot the net work output as a function of this quality. 7–86 Liquid water at 120 kPa enters a 7-kW pump where its pressure is raised to 3 MPa. If the elevation difference betw...
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